MAGNET MANUFACTURING METHOD AND MAGNET
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United States of America Patent
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Issued Date -
Oct 20, 2016
app pub date -
Apr 8, 2016
filing date -
Apr 8, 2016
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Abandoned
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Abstract
A magnet manufacturing method has preparing magnetic powder of a hard magnetic material, which includes one or more of an Fe-N-based compound and an R-Fe-N-based compound, pressurizing and molding the magnetic powder at a pressure equal to or higher than a fracture pressure at which particles of the magnetic powder are destroyed in order to obtain a primary molding, and heating the primary molding at a temperature lower than a decomposition temperature of the magnetic powder. A particle size distribution measured for the magnetic powder indicates that, for the magnetic powder, a ratio of a particle size with a cumulative frequency of 50% to a particle size with a cumulative frequency of 3% is less than eight.
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